How to remove duplicates from xml loaded from the web in iOS programming

Question

Say if I have the following profiles parsed from an xml file on the web and wanted to remove the duplicates, how would I do that? For example there are 2 profiles with the same first name (Amin) and I only want to display 1. I am displaying all the profiles parsed from the xml file in the command output window using NSLog and say if I wanted to have a button that should filter the profiles and delete the duplicates and update the command output window (using NSLog) with duplicates being removed.

<profiles>
  <profile>
    <firstname>Amin</firstname>
    <lastname>Ziarkash</lastname>
    <address>Melisstokelaan 2068</address>
    <zipcode>2541 GH</zipcode>
    <city>Den Haag</city>
    <email>[email protected]</email>
  </profile>

  <profile>
    <firstname>Niko</firstname>
    <lastname>De Vries</lastname>
    <address>Sterrelaan 34</address>
    <zipcode>3342 JH</zipcode>
    <city>Amsterdam</city>
    <email>[email protected]</email>
  </profile>

  <profile>
    <firstname>Marcel</firstname>
    <lastname>Janssens</lastname>
    <address>Voorhoeveweg 11</address>
    <zipcode>6006SV</zipcode>
    <city>Weert</city>
    <email>[email protected]</email>
  </profile>

  <profile>
    <firstname>Amin</firstname>
    <lastname>Ziarkash</lastname>
    <address>Melisstokelaan 2068</address>
    <zipcode>2541 GH</zipcode>
    <city>Den Haag</city>
    <email>[email protected]</email>
  </profile>

  <profile>
    <firstname>Kevin</firstname>
    <lastname>De Vries</lastname>
    <address>Stuyvesantweg 2</address>
    <zipcode>2541 GH</zipcode>
    <city>Wolvega</city>
    <email>[email protected]</email>
  </profile>

  <profile>
    <firstname>Niko</firstname>
    <lastname>De Vries</lastname>
    <address>Sterrelaan 34</address>
    <zipcode>3342 JH</zipcode>
    <city>Amsterdam</city>
    <email>[email protected]</email>
  </profile>

  <profile>
    <firstname>Gido</firstname>
    <lastname>Van der Veen</lastname>
    <address>Klausstraat 12</address>
    <zipcode>7726 GH</zipcode>
    <city>Den Haag</city>
    <email>[email protected]</email>
  </profile>

  <profile>
    <firstname>Nilo</firstname>
    <lastname>Yaqobi</lastname>
    <address>Kamperslaan 15</address>
    <zipcode>3728 JH</zipcode>
    <city>Delft</city>
    <email>[email protected]</email>
  </profile>

  <profile>
    <firstname>Casper</firstname>
    <lastname>Van Zanten</lastname>
    <address>Molenweg 98</address>
    <zipcode>3411 HJ</zipcode>
    <city>Amsterdam</city>
    <email>[email protected]</email>
  </profile>

  <profile>
    <firstname>Geert</firstname>
    <lastname>Diujkstra</lastname>
    <address>Binnenszijde 47</address>
    <zipcode>5362 PL</zipcode>
    <city>Amsterdam</city>
    <email>[email protected]</email>
  </profile>

  <profile>
    <firstname>Thijs</firstname>
    <lastname>Venema</lastname>
    <address>Koolstraat 21</address>
    <zipcode>6473 AA</zipcode>
    <city>Amsterdam</city>
    <email>[email protected]</email>
  </profile>

</profiles>

The code for parsing:

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

bool isStatus;
ViewController *currentProfile;
ViewController *xmlParser;
NSXMLParser *parser;
NSMutableString *currentNodeContent;

-(id)loadXMLByURL:(NSString *)urlString
{
    profile = [[NSMutableArray alloc] init];
    NSURL *url = [NSURL URLWithString:urlString];
    NSData *data = [[NSData alloc] initWithContentsOfURL:url];
    parser = [[NSXMLParser alloc] initWithData:data];
    parser.delegate = self;
    [parser parse];
    return self;
}

-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    currentNodeContent = (NSMutableString *) [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    if([elementName isEqualToString:@"firstname"])
    {
        currentProfile = [ViewController alloc];
        isStatus = YES;
    }
}

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if([elementName isEqualToString:@"firstname"])
    {
        currentProfile->firstName = currentNodeContent;
        NSLog(@"%@",currentProfile->firstName);
        [profile addObject:currentProfile];
    }
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    xmlParser = [[ViewController alloc] loadXMLByURL:@"http://dierenpensionlindehof.nl/profiles1.xml"];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

EDIT

I made a separate class for the parsing to ease the process. Now I want to load the -(void)loadXML from this class (XMLParser class) in the original ViewController class's viewDidLoad but it gives me errors.. Can someone tell me what I am doing wrong here?

ViewController.m

#import "ViewController.h"
#import "XMLParser.h"


@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self XMLParser:loadXML];

}

XMLParser.h

#import <Foundation/Foundation.h>
#import "ViewController.h"

@interface XMLParser : NSObject

{
    NSMutableArray *profile;
    NSString *firstName;
}

- (void)loadXMLByURL:(NSString *)urlString; //Added after edit
- (void)loadXML; //Added after edit

@end

XMLParser.m

#import "XMLParser.h"

@implementation XMLParser

bool isStatus;
XMLParser1 *currentProfile;
XMLParser1 *xmlParser;
NSXMLParser *parser;
NSMutableString *currentNodeContent;

-(void)loadXMLByURL:(NSString *)urlString
{
    profile = [[NSMutableArray alloc] init];
    NSURL *url = [NSURL URLWithString:urlString];
    NSData *data = [[NSData alloc] initWithContentsOfURL:url];
    parser = [[NSXMLParser alloc] initWithData:data];
    parser.delegate = self;
    [parser parse];
}

-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    currentNodeContent = (NSMutableString *) [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    if([elementName isEqualToString:@"firstname"])
    {
        currentProfile = [XMLParser1 alloc];
        isStatus = YES;
    }
}

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if([elementName isEqualToString:@"firstname"])
    {
        currentProfile->firstName = currentNodeContent;
        NSLog(@"%@",currentProfile->firstName);
        [profile addObject:currentProfile];
    }
}

- (void)loadXML
{
    [self loadXMLByURL:@"http://dierenpensionlindehof.nl/profiles1.xml"];
}

@end